Dual Pixel CMOS AF
Canon's implementation of on-sensor phase-detect AF. Every imaging photosite is split into two photodiodes, giving 100% frame coverage with no AF-pixel gaps in the image.
Most on-sensor PDAF systems dedicate a subset of pixels to focus and interpolate them out of the image. Canon's Dual Pixel AF splits every pixel into two — both halves contribute to the final image AND to AF.
Practical advantages
- No PDAF artifacts. Some early Sony / Nikon sensors showed faint banding from interpolated AF pixels in extreme low-light recovery; Dual Pixel sensors do not.
- Smooth video focus. Continuous AF transitions are notably smoother than dedicated-PDAF designs — a major reason Canon dominated mirrorless video AF early on.
- Frame coverage. Up to 100% of the image is AF-capable on R5, R3, R5 II.
In comparisons
Sony A7 IV, Nikon Z8, and similar competitors have closed the smoothness gap with software refinement and faster sensor readout. The hardware advantage remains, but the visible difference in 2024+ video shoots is small.
How to use Dual Pixel CMOS AF in a real comparison
Canon's implementation of on-sensor phase-detect AF. Every imaging photosite is split into two photodiodes, giving 100% frame coverage with no AF-pixel gaps in the image. In practice, this is most useful as one part of a decision rather than a standalone quality badge. Compare it alongside the workload, room, ecosystem, budget, and ownership constraints that apply to you; the strongest published figure is not automatically the best outcome for every buyer.
What to check next
Open a product page and check the stated value, configuration, price, and related trade-offs before treating this term as decisive. It is especially relevant in .
Avoid the one-number trap
Manufacturers can describe the same capability under different conditions. Compare like-for-like variants, check the unit and test condition where available, and use a head-to-head page to see whether a measurable difference is material for your own use.
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